261100434 has 32 divisors (see below), whose sum is σ = 597926016. Its totient is φ = 74459520.

The previous prime is 261100421. The next prime is 261100459. The reversal of 261100434 is 434001162.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 261100434.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17814 + ... + 28974.

It is an arithmetic number, because the mean of its divisors is an integer number (18685188).

Almost surely, 2^261100434 is an apocalyptic number.

261100434 is an abundant number, since it is smaller than the sum of its proper divisors (336825582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261100434 is a wasteful number, since it uses less digits than its factorization.

261100434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11730.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 261100434 is about 16158.6024766995. The cubic root of 261100434 is about 639.1496143848.

Adding to 261100434 its reverse (434001162), we get a palindrome (695101596).

The spelling of 261100434 in words is "two hundred sixty-one million, one hundred thousand, four hundred thirty-four".